Armored cable connector
A cable connector terminates an armored cable in a knockout in a wall of an electrical enclosure. The connector includes a one-piece connector body having a forward end and plurality of side walls extending from the forward end in cantilevered fashion to define a cavity for receipt of an end of the cable. The forward end of the connector body is insertable into the knockout and the cantilevered side walls are deflectable to permit such insertion. The side walls further accommodate insertion of a cable into the cavity for retentively supporting the cable to the enclosure. The side walls of the connector body include outwardly extending tabs for engaging wall of the enclosure about the knockout. Side walls further include inwardly extending fingers for engaging the cable.
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This application claims priority to U.S. Provisional Application No. 60/577,737, filed Jun. 7, 2004.
FIELD OF THE INVENTIONThe present invention relates generally to a connector for terminating the end of an electrical cable. More particularly, the present invention relates to a one-piece connector for connecting a flexible armored cable to a knockout of an electrical enclosure.
BACKGROUND OF THE INVENTIONAn electrical wire is typically terminated in a junction box, panel box or other electrical enclosure. The wire enters the enclosure through an opening referred to as a knockout in a wall of the enclosure. In order to terminate the wires in the enclosure, an end of a conduit (cable) which encloses the wires is attached to the enclosure at the knockout.
Not only are cable connectors of this type manufactured to effect electrical engagement between the conduit and the electrical enclosure, these connectors should also provide strain relief attachment of the cable to the enclosure. Thus, when a load placed on the cable, tending to pull the cable out from the enclosure is applied, the connector should adequately resist such a load and maintain the cable in mechanical and electrical engagement with the enclosure.
The art has seen a wide variety of connectors and termination devices used to attach the conduit to the knockout of the electrical enclosure. Certain of these connectors are specifically designed for attaching flexible metallic armored conduits. These connectors also serve to effect electrical engagement between the conduit and the electrical enclosure. Examples of such conduit connectors are shown in, among others, U.S. Pat. Nos. 3,858,151; 4,012,578; 4,021,604; 4,619,332; 4,990,721; 6,034,326; and 6,114,630.
While each of these devices serve adequately for their intended purposes, there is a need for a conduit connector which allows ease of insertion and attachment to the knockout of the electrical enclosure and which securely retains the conduit to the enclosure. Moreover, it is desirable to employ a conduit connector which is simple and cost effective to manufacture and assembled. Additionally, it is desirable to provide a conduit connector which permits the subsequent insertion of the conduit into the connector after the connector has been attached to the enclosure.
SUMMARY OF THE INVENTIONThe present invention provides a cable connector for terminating an end of a cable to a knockout of an enclosure. The connector includes a one-piece connector body having a forward end and plurality of side walls extending rearwardly from said forward end in cantilevered fashion to form a cavity for receipt of an end of the cable. The forward end of the connector body is insertable into the knockout with the cantilevered side walls being deflectable to permit retentive insertion thereinto. The side walls further accommodate insertion of the cable end into the cavity for retentively supporting the cable to the enclosure.
The side walls may further include outwardly extending tabs for engagement with the enclosure about the knockout. Additionally, the side walls may include inwardly extending fingers for engaging the cable, especially flexible armored cable.
The present invention also provides a method for terminating an end of a cable to a knockout of an enclosure. A connector body having a forward end including a plurality of side walls extending from the forward end in cantilevered fashion is provided. The connector body defines a cavity. The forward end of the connector body is inserted into the knockout with the side walls deflecting to permit the insertion. Thereafter, the cable end is inserted into the cavity of the connector body in order to retentively support the cable to the enclosure.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention provides an electrical connector 10 which is used to terminate a cable 12 to a knockout 14 in a wall 16 of an electrical enclosure 18. In the present illustrative embodiment, connector 10 is used to terminate a flexible armored cable 12 which includes a helical groove 12a thereabout to enhance flexibility. The armored cable 12 supports a plurality of electrical wires (not shown) therethrough for termination within the electrical enclosure 18.
As is generally shown in
The manufacture of the connector of the present invention may now be described.
Referring to
The second stage of manufacture of the connector of the present invention is shown in
The third stage of manufacture of the connector 10 of the present invention is shown in
The fourth stage of manufacture of connector 10 is shown with respect to
The finished connector body 22 is shown in
Having described the manufacturer of the connector body 22 of the present invention, its use may be seen with respect to
It is contemplated that the connector body 22 formed in its final configuration as shown in
Thereafter, armored cable 12 may be inserted into the interior 30 of connector 10. Inwardly directed fingers 36 make engagement with the helical grooves 12a. Insertion of the cable 12 into the interior 30 of connector 10 serves to expand the cantilevered side walls 29 so that secure engagement is made between the connector 10 and the enclosure 18. This secures the connector to the enclosure and the cable to the connector. Electrical continuity is established between the armored cable 12 and the metallic enclosure 18 by virtue of the forwardly directed fingers 36 and the extending tabs 34.
As may be appreciated, the connector 10 of the present invention is securely retained to cable 12 in the knockout 14 of the electrical enclosure 18. Not only does the present invention establish electrical continuity between the armored cable 12 and the enclosure 18 but also provides for strain relief of the cable attached to the electrical enclosure such that when a load is placed on the cable tending to pull the cable from the enclosure 18, the connector securely retains the cable in the knockout of the electrical enclosure.
Referring now to
It is contemplated that a load placed on cable 12 in the direction of arrow A will cause the inwardly directed fingers 36, which are seated in the groove 12a of the cable 12 (
Thus, upon continued application of the pull out force, the cable 12 will be maintained in mechanical and electrical engagement with the connector 10. The force of the load is thereby transferred from the connector to the wall 16 of the enclosure 18 which results in the bowing of the wall.
Various changes to the foregoing described and shown structures will now be evident to those skilled in the art. Accordingly, the particularly disclosed scope of the invention is set forth in the following claims.
Claims
1. A cable connector for terminating an end of a cable in a knockout in a wall of an enclosure comprising:
- a one-piece connector body having a forward end and a plurality of side walls extending from said forward end in cantilevered fashion to form a cavity for receipt of an end of said cable;
- said forward end of said connector body being insertable into said knockout, with said cantilevered side walls being deflectable to permit said insertion;
- said side walls further accommodating insertion of said cable end into said cavity for retentively supporting said cable to said enclosure.
2. A cable connector of claim 1 wherein said side walls include outwardly extending tabs for engaging said wall of said enclosure about said knockout.
3. A cable connector of claim 1 wherein said side walls include inwardly extending fingers for engaging said cable.
4. A cable connector of claim 2 wherein said side walls include a set of first tabs which are insertable through said knockout upon said insertion for engagement with one side of said wall of said enclosure.
5. A cable connector of claim 4 wherein said side walls include a set of second tabs spaced from said first tabs and which are engageable with the other side of said wall of said enclosure.
6. A cable connector of claim 5 wherein said set of first and second tabs are struck from said side walls.
7. A cable connector of claim 3 wherein said inwardly extending fingers are from struck said side walls.
8. A cable connector of claim 1 wherein said cable is an armored cable having a helical grove thereabout and wherein said inwardly extended fingers are engageable with said helical groves upon insertion of said armored cable into said cavity.
9. A cable connector of claim 1 wherein said connector body is formed of a conductive material.
10. A connector body of claim 9 wherein said conductive material is metal.
11. A connector of claim 1 wherein said side walls of said connector are outwardly pivotable upon application of a pullout load on said cable.
12. A connector of claim 11 wherein said inwardly extending fingers are further engageable with said cable upon said outwardly pivotable movement of said side walls.
13. A method of terminating an end of a cable to a knockout in an enclosure comprising:
- providing a connector body having a forward end and a plurality of side walls extending from said forward end in cantilevered fashion to form a cavity;
- inserting said forward end of said connector body into said knockout with said side walls deflecting to permit said insertion; and
- inserting said cable end into said cavity to retentively support said cable to said enclosure.
14. A method of claim 13 wherein said providing step includes providing said side walls with outwardly extending tabs for engaging said wall of said enclosure upon said connector body inserting step.
15. A method of claim 13 wherein said providing step includes providing inwardly extending fingers on said side wall for engaging said cable upon said cable inserting step.
Type: Application
Filed: May 26, 2005
Publication Date: Dec 8, 2005
Patent Grant number: 7148431
Applicant:
Inventor: Roger Pyron (Bartlett, TN)
Application Number: 11/137,951